Wenger's most expensive Arsenal signings

1. Mesut Ozil - £42.5m

Mesut Ozil's club-record 42.5 million pound arrival at the Emirates Stadium stunned many. Arsenal had negotiated with Real Madrid quietly for weeks as the Primera Division side did similarly with Tottenham for Gareth Bale.

Just hours after the Welshman's world-record £86m move to the Santiago Bernabeu was confirmed, news started filtering through that Arsene Wenger had struck a deal to smash Arsenal's transfer record for the German.

Ozil's move was finally confirmed in the final hours of the transfer window and he started life brightly with an assist within 11 minutes of his debut.

However, the Germany international's form slowly declined as he struggled with the pace of the Premier League, with his performances at the World Cup also attracting criticism.